Docs and API fixes

[lsbardel]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.00787% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.55%. Comparing base (3d699ef) to head (2b93c78).

Files with missing lines	Patch %	Lines
quantflow/rates/no_discount.py	75.00%	7 Missing ⚠️
app/api/volatility.py	64.70%	6 Missing ⚠️
quantflow/rates/cir.py	92.10%	6 Missing ⚠️
app/api/cointegration.py	0.00%	5 Missing ⚠️
quantflow/rates/vasicek.py	94.44%	3 Missing ⚠️
quantflow/ta/ewma.py	86.66%	2 Missing ⚠️
app/__main__.py	0.00%	1 Missing ⚠️
app/api/rates.py	75.00%	1 Missing ⚠️
quantflow/options/parity.py	80.00%	1 Missing ⚠️
quantflow/options/surface.py	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #74      +/-   ##
==========================================
+ Coverage   88.42%   89.55%   +1.12%     
==========================================
  Files          71       84      +13     
  Lines        4183     4741     +558     
==========================================
+ Hits         3699     4246     +547     
- Misses        484      495      +11     

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